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Operating Segments - Segment Financial Data (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Operating segments number | segment     3  
Revenues:        
Revenues $ 6,078 $ 4,950 $ 12,745 $ 9,060
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 68 40 121 87
Segment adjusted EBITDA 450 474 962 1,106
Maintenance capital 71 35 131 81
Transportation        
Revenues:        
Revenues 258 244 483 484
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 68 40 121 87
Segment adjusted EBITDA 298 274 571 555
Maintenance capital 27 23 57 57
Facilities        
Revenues:        
Revenues 136 132 270 270
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment adjusted EBITDA 180 161 368 327
Maintenance capital 39 9 66 18
Supply and Logistics        
Revenues:        
Revenues 5,781 4,648 12,176 8,467
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment adjusted EBITDA (28) 39 23 224
Maintenance capital 5 3 8 6
Operating Segments        
Revenues:        
Revenues 6,497 5,325 13,580 9,795
Operating Segments | Transportation        
Revenues:        
Revenues 425 403 814 787
Operating Segments | Facilities        
Revenues:        
Revenues 289 270 582 535
Operating Segments | Supply and Logistics        
Revenues:        
Revenues 5,783 4,652 12,184 8,473
Intersegment        
Revenues:        
Revenues (419) (375) (835) (735)
Intersegment | Transportation        
Revenues:        
Revenues (167) (159) (331) (303)
Intersegment | Facilities        
Revenues:        
Revenues (153) (138) (312) (265)
Intersegment | Supply and Logistics        
Revenues:        
Revenues (2) (4) (8) (6)
Intersegment Adjustment        
Revenues:        
Revenues $ (97) $ (74) $ (184) $ (161)